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A comment on Australians Scour Desert for Dangerous Radioactive Capsule Smaller Than a Penny. Parent comment
This page [0] has an image of a small scintillator plus photomultiplier, but probably too thick for a phone.
[0]https://scan-electronics.com/en/dosimeters/radiacode-101
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This page [0] has an image of a small scintillator plus photomultiplier, but probably too thick for a phone.
[0]https://scan-electronics.com/en/dosimeters/radiacode-101